William mason



(No Model!) W. MASON.

GAS OPERATED GUN.

No. 525,151. Patented Aug. 248, 1894i Sfrarns @essere Wimmer MASON, on N'Ew HAVEN, CONNECTICUT, AssIGNoR To THE' wlNonnsfrnnRnPE'rme ARMs COMPANY, or' SAME PLACE; f

ee'snoeesarso een.

r SPECIFICATION forming part of Letters Patent No. 525,151, dated Augdst 28, 1 89,4.

Be it knewn that I, WILmAM MASON, ci` New Haven, in the countyof New Haven and.

State of Connecticut, have invented a new 5 ,Improvement in Automatic Guns;` andi do .hereby declare lthe following, when taken inconnection with accompanying drawings and A' theletters of reference marked thereon, to be a full, clear, and exact description of lthe same,

roand which said drawingsy constitute part ofthis specication, and represent, in-Y Figure 1 aview in side elevation of one torin which an automatic gun'constructed in accordance with. my invention may assurde;

i5 Eig. an enlarged reverse View ot` the gun partly in horizontal section and partly in elevation; ,Fig 3, a View in vertical longitudinal section of the forward end of the gun on the line efe' of Fig. 6; Fig. 4, an enlarged view so of the gun in vertical transverse section on v4che line v of Fig. 1;' Fig. 5, a view oi the r`gun in front elevation, showingthegas-deilectozgthe gun-barrel and the lug of the slide;

, Fig. 6, a View in Verticaly section on the line z5y 'y-y or Fig. 2 through the gas-defiector and gun-barrel; Fig. 7, aI detached reverse plan j vView of the slide; Fig. 8, a detached View thereof in front elevation. e

My' nivention relates to an improvement in '3.o that class of automatic .guns in which the 4o beyond the same, and adapted to deflect the gases issuing from the mouth of the gunbar "rel backward, a slide mounted on the gunbarrel in position to be impinged upon and moved rearward by the gases deflected, and an operating-rod connected with the said slide at its 'forward end, and at, its rear end with the feeding and firing mechanism of the gun.v

` -My invention fnrtherconsistsin certain de- 'ltails of construction andl combinations of 5o -partsas will be hereinafter described and pointed out in the claims; L f' applianonneaseparatem,1893.' serai no.' 486.172. .Gemeten l In carryingy out myfinvention as'herein shown, I construct the extreme'outer end or screw=threads-a, adapting it for the attach` ment of a gasdeiiector B, which is constructed with an interiorly threaded opening B', en-

tering it from its rear'end, and adapting it to be screwed'over the threaded outer end of- Y yond the said end of ldie bore, whereby two.

pointed or beveled delecting edges b b, are formed. front of the bore of the gun, and deflect the expanding gases of explosion outward, and then rearward through the passages which are open at their rear ends. The said passages intersect the threaded bore B of the deflector, as clearly shown in Fig, 6 of the These edges stand substantially in drawings, so that the internal threads of the said opening are interrupted, and only take into the threads @,of the gun-barrel at points' between the'passages. l

As herein shown the deiiector is made oblong in transverse section, andarranged horizout-ally, as shown in Figs. 5 and 6` of the v drawings. That form provides roon for the gas passages, and is light. i

Immediately in rear of the rear end of the de- Hector, I locate a slide C upon the gun-barrel, on which it is free to slideback and forth within limits. This slide-is provided with a central opening C', adapting it to tit over the gunbarrel, and at its forward endwith two shallow recesses C2 C2, arranged to 'register with the open, rear ends of the gas-passages 133133 of (he gasdeleotor, the said recesses being lol cated on opposite sides of the .opening C.` A The said slide is alsoconstrncted with a lug' C3, for the attachmentof the forward end of `the operating-rod I), the rear endof which is IOO f but do not limit myself to it.

secured to the forward end of an action-bar E, eonstituting a lmember of the feeding and firing mechanism of the gun, said mechanism being of any approved construction, and too well known to need special description or illustration herein.

The gun-barrel, as shown by Figs. 1 and 2 of the drawings, is provided with a bearing F, for the rod to play through. A spiral operating spring G, interposed between the rear end of the lug C3, and the forward edge of the said bearing F, exerts a constant edort to keep the forward end of the slide in engagement with the reariend of the gas-deflector, and operates to restore the slide toits normal position after it has been pushed backward by the deflected gases of explosion.

As herein shown the gun-barrel is made polygonal throughout the main portion of its length, its forward end upon which the gas de- ;tlector and slide are monnted,`oeing rounded. I conceive that to be the best construction,

The bar is provided with an operating handle E', by means of which the gun is red manually. The forward end of the said arm or slide plays in a recess formed in the stock ll, of the gun, while its rear end enters the receiver I of the gun in the usual manner, for operating the breechmechanism, which may be of any approved construction, and does not require description or illustration.

It will be readiiy understood that the gun having once been fired manually, the Vgases of explosion will issue from the mouth of the gun-barrel, and being deflected rearward by the gas deliector, will force the sli-de backward against the tension of the operating spring, and thus move the operating-rod and the action bar E, backward, whereby the feeding and tiring mechanism is partially operated. The spring now reasserts itself, and completes the operation of the said mechanism, and another cartridge is discharged. The last action of the gun is automatic, and its automatic action will be continued as long as the gun is supplied with cartridges, and as long as the trigger is prevented from restraining the firing hammer at the conclusion of the rearward movement of the operating-rod,

for every time a cartridge is exploded, a portion of the gases of explosion will be deflected rearward, with the effect of pushing back the slide and rod. r

It is apparent that in carrying out my invention, the details of the construction of the gas-deflecior and slide may be varied, and I would therefore have it understood that I do not limit myself to the exact construction shown and described but hold myself at liberty to make such variations therein as may fairly fall within the spirit and scope of my invention. I am aware, however, that automatic guns operated by the gases of explosion are not new, and that it is not new t'o take the said gases from the mouth of the gunbarrel, and I do not claim such a construction broadly.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An automatic gun, having a gas-defiector secured to andprojecting beyond the muzzle of the gun-barrel, and adapted to deflect a portion of the gases of explosion rearward, a slide mounted upon the gun-barrel, andarranged to be impinged upon by the deliected gases of explosion, and connection between the said slide and the feeding and firing mechanism of the gun, substantially as described.

2. An automatic gun, havingagas-defleclor attached to and projecting beyond the muzzle of the gun-barrel, and constructed with a passage`located in line with the bore of the gun, and with two gas-passages extending at their forward ends beyond the muzzle of the gun, and open at their rear ends, a slide mounted upon the gun-barrel and engaging at its forward end wit-h the rear end of the deflcctor, and means for connecting the said slide with the feeding and firing mechanism of the gun, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

WILLIAM' MASON. Witnesses:

Freni) C. EAnLn, G solcon D. SEYMOUR. 

